fever greater than equals to 39.5; information has been downloaded from the regulatory authority (it-minisal02-844729). this spontaneous report was received from a other healthcare professional referring to a 1-year-old male patient. the patient's current conditions, medical history, concomitant medications and drug reactions/allergies were not reported. on 19-jan-2022, the patient was vaccinated with measles, mumps, rubella and varicella (oka-merck) virus vaccine live (recombinant human albumin) (rha) (proquad), via subcutaneous route in the left deltoid (lot # u025964 has been verified to be a valid lot number and expiration date was not reported but upon internal validation was established as 31-jan-2023) (dose, strength, indication and formulation were not reported). on 26-jan-2022, the patient experienced hyperpyrexia (reported as "fever greater than equals to 39.5 (units not provided)"). on 29-jan-2022, the patient recovered from hyperpyrexia. the causality assessment was not provided. the agency considered the event "hyperpyrexia" to be medically significant